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In page Management of Parkinson's disease:

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Dopamine agonists in the brain have a similar effect to levodopa since they bind to dopaminergic postsynaptic receptors.[1] Dopamine agonists were initially used for patients experiencing on-off fluctuations and dyskinesias as a complementary therapy to levodopa, but they are now mainly used on their own as an initial therapy for motor symptoms with the aim of delaying motor complications.[1][2] When used in late PD, they are useful at reducing the off periods.[1] Dopamine agonists include bromocriptine, pergolide, pramipexole, ropinirole, piribedil, cabergoline, apomorphine, and lisuride.